accessing controls from diff updatepanels

Hi

Just wondering is it possible to access controls from diff update panels

I have a treeview in 1 updatepanel, upon selecting a node in the tree I want to display a panel outside the updatepanel, possibly in another updatepanel

confusing? maybe

Dim panel1 As Panel = CType(Me.UpdatePanel1.FindControl("panel10"), Panel)

Panel1.Visible = True

It definately finds the contro, but will not mae it visible

thoughts ?

Hi!

Are you calling UpdatePanel1.Update() after you set the visible property to true? If you are missing that the Panel will be "visible" but not "showing" as visible.

Also, just a doubt: Why you need to use FindControl to find controls inside UpdatePanels? They aren't NamingContainers, thus you should be able to call them directly from the page.

Regards,

Juan

One more note: if you're talking about using a TreeView, note that the TreeView control isn't compatible with partial rendering (so it can't get updated inside an UpdatePanel). Seehttp://ajax.asp.net/docs/overview/UpdatePanelOverview.aspx#UpdatePanelCompatibleControls.

A good way to think about the UpdatePanel is that it doesn't really change the way postbacks work. So if you can do what you want to with a regular postback, then it should just be a matter of wrapping the write regions of the page in UpdatePanels and setting up the triggers (or calling UpdatePanel1.Update() in the code-behind) to make sure those regions of the page get updated when appropriate during the async postback. My advice would be to get this working how you want with regular postbacks, then add UpdatePanels (which will by default all update on every async postback), and finally optimize by setting UpdateMode="Conditional" and setting up your triggers, so you selectively update the parts of the page that you need to.

thanks guys , some great advice there

UpdatePanel1.Update() was the key here

Steve Marx:

One more note: if you're talking about using a TreeView, note that the TreeView control isn't compatible with partial rendering (so it can't get updated inside an UpdatePanel). Seehttp://ajax.asp.net/docs/overview/UpdatePanelOverview.aspx#UpdatePanelCompatibleControls.

Steve , Is this something that will be fixed in future AJAX releases

I also have some file upload controls on the page that I really need to have there

A form, a treeview, a update panel, and required field validator.

Ok. Lets see if I can explain this. I have a treeview in a uppdate panel. It has an "Add User" node and some "Users" nodes uder it(Siblings). I have a "Add/Edit User" form in the page, inside a panel inside a update panel. This form has a submit command button and the fields have required field validators. These validators are in a ValidationGroup with the submit button. It''s set up so that when a user clicks the "Add User" node, the form panel is made visible so that a new user can be added. When you click on a particular users node, the users information is loaded into the fields and the panel is set to visible so you can edit the users information.

Here's the issue:

When you select the "Add User" node on the tree the blank fields load and all is good. If after that you click on a users node, the users info is loaded into the fields as it should, and that update panel is updated, but all the validators fire. So, selecting a node in the treeview causes the validation to fire even though they are grouped with the Submit button. I expected the validation grouping would solve the issue, but it didn't. Now I'm stumped. Just staring at it.?Any ideas? Anyone?

Thanks,

CL

One issue could be that treeviews aren't supported in updatepanels... We have noticed some strange issues when we were trying to get one work. You may also want to make sure that everything else has causes validation set to false.
Thanks for your reply. I'll look into the causes validation thing and see if that works.
mdenn, you're a dang genius. That worked. Thanks a bunch.